http://www.energyindependencenow.org/pdf/fs/EIN-TobaccoCarExhaust.pdf

http://ntp.niehs.nih.gov/ntp/roc/eleventh/profiles/s069dies.pdf

http://www.fumeavent.com/Vehicle+Exhaust+Dangers.htm

Using numbers provided on the American Cancer web page and a state of Alaska measurment of carbon monoxide:
An automobile warming up for 20 minutes in Alaska creates as much carbon monoxide as smoking 3 packs of 	cigarettes a day for 100 years.